The state of not existing; absence of existence; the negation of being; usually used with reference to existince in the real world, or logical possiblity; as, the nonexistence of vaporware does not go unnoticed long.

... success, in which case the United States would have been justified in turning their measures exclusively against France. The British Government would, however, neither rescind the blockade nor declare its nonexistence, nor permit its nonexistence to be inferred and affirmed by the American plenipotentiary. On the contrary, by representing the blockade to be comprehended in the orders in council, the United States were compelled so to regard ...— A Compilation of the Messages and Papers of the Presidents - Section 4 (of 4) of Volume 1: James Madison • Edited by James D. Richardson